Starting and stopping device for offset-printing machines



Feb. 15 L. I

STARTING AND STDPPING DEVICE I01! OFFSET PRIN TING IAOHINBS Filed July'22. 1925 2 Shuts-Shoot 1 139. 1. g

therewith.

Patented Fdb. 1927. I

" UNITED" STATES PATENT oFFicE.

LEONHARD HORN,

OF AUGSBURG, GERMANY, ASSIGNOR To MASGHINENFABRIK AUGS- rona'rron' orGERMANY.

s'rnnrme in s'rorrme DEVICE Application filed July My invention relatesto a device for rendering operative and inoperative the cylinders andinking rollers of rotary offset-printing machines andconsists moreessentially in providing an appliance for each printing machine, wherebythe cylinders and inking rollers may be moved into and out of operativepositions the actuating members being electrically connected with eachother in such a manner, that theyf may be operated eithersimultaneously, individually or in groups.

Further objects of my invention are to provide means for individuallyoperating the several appliances, which are associated with the printingmachines, by the latter, so as to have each appliance connected with itscorresponding printing machine by an electric coupling also, to providemeans for securing the appliances in their tempo= rary positions, andfinally to so arrange the terminals of the windings of the couplingmagnets for the several printin machines, that each winding may beindividually disconnected.

The known devices, for rendering operative and inoperative the cylindersand inking rollers of rotaryprinting machines for offset-printing,especially in rubber printing machines having several printin mec'anisms for printing in a plurality ot colors, consist essentially in arocking double pawl which imparts a definite angular motion to. asegment and the various parts connected This construction has thedisadvantage that the desired action does not take place at once, butonly after the pawl has come into a certain angular position. In thatway, especially in case of auxiliary motors, that is to say, in case ofslow operation of the machine, a great loss of time is caused. To besure, devices are known, whereby said disadvantage may be avoided, butin .these devices, a special electric motor is necessary for theoperation. The two just referred to constructions have still a furtherdisadvantage; In all known devices of this kind, the motion producintheoperative and inoperativeposition of the niachine originates from amachine element, from which the angular motion necessary for producingthe inoperative position is conveyed to the cylinders and rollers --tobe moved to inoperative position. Since the F03 OFFSET-PRINTINGMACHINES.

22,-.1925, Serial to. 45,184, and in Germany September 1, 1924.

cylinders and rollers as a rule are \positioned at a great distance fromeach other, there are required complicated rod systems, which are liableto causc difiicuTties in connection with the mounting and assembling ofthe parts and' in addition thereto, such complicated rod ,systems renderthe machine in a considerable degree less accessible. The device for,producing the inoperative position becomes still more complicated, ifthe necessity arises of throwing several printing machines intoinoperative position, as is the case with most machines of this kind,especially machines for multi-color printing. Coupling deviees musttherefore be provided, which are included in. the rod systems, in orderto enable .the devices for the several printing machines to be coupledand uncoupled All these disadvantages are avoided by the presentinvention, which is based upon the principle, that each printing machineshall be provided with an individual device for producing the operativeand in operative position, which device isoperated by he correspondingprinting machine. The device itself, according to this invention, islocated in immediate proximity to the parts to be controlled, so thatthe above saidrod system, which is off a complicated nature and liableto obstruct the access to the machine, can be dispensed with. \The inconnection with the operation;

devices according to this invention are operated by electricallycontrolled couplings, which are manually connected in the cur-- cuit bymeans of a push button, and which are automatically disconnected bymeans of a second push-button. By such an arrangeinent it will bepossible to start. and stop the printing machines either individually,or simultaneously, or in groups, as desired.

In the drawings in which ll have,by way of illustration shown anembodiment'of my invention, Fig. l is asideelevation oil a printingmachine provided with the mechanism. for producing the" inoperative position; Fig. 2 is a section along line A--B-G in Fig. 1 and 3 a diagramrepresenting the electrical connections of for severalprinting machines.

The printing machine shown comprises the plate cylindeg a, cylinder '6and in m 1 for rendering inoperative the couplings the iubber theimpression cylinder 0.. i The mechanism '0' consequently will attractits armatures r,

action of the eccentric k, the shaft a and the rubber cylinder 1; willreceive a rocking motion.

For rendering inoperative the inking rollers d, the double lever m isused which ismounted to rock about shaft Z, said double lever beinglikewise actuated by the lever of the eccentric k and more particularlyby the aid of a connecting rod.

The mode of coupling the shaft 6 with the cylinder shaft'i will be seenin Fig. 2. Three electro-magnets 0 are mounted upon a com mon supportingplate p. Said magnets, when energized by an electric current, willattract their armatui'es 1' which are mounted upon a common plate 9.Thereby, the gear f which is longitudinally'displaceable upon the shaft2' and mounted upon the plate q will be connected with the cylindershaft i by means of the clutch s. The shaft e will now be rotatedby thegear 9, which meshes, on the one hand, with the gear f and, on the otherhand, with the gear hsecured to shaft c. On the latter there isfurthermore mounted a cam-.discu, having in its circumference twodepressions displaced from each other by 180, and adapted to receive thespring-actuated roller 23 to thereby secure the several parts .in theirpositions. Furthermore two projections 12 are provided upon the gear it,said projections in their end po sitions pressin the push-button w,thereby interrupting t e electric current for said magnets. The coupling8 is controlled by the action of springs as designed to disengage saidcoupling, as soon as the current for the magnets is interrupted.

s Fig. 3 shows the connections forthe ,coupling magnets 0 O and O, ofthree printin machines I, II and III, respectively,

said printing machines being operated by pressing the push-buttons n nand'nfi. 'By means of the projections c '0 and v the conduit for theconnections to the couplin magnets 0 O and 0 will be interrupte .The twoterminals of the'magnet windin are connected with each other by wayofthe disconnecting switches 31 g and y in such a way that every windingmay be individually disconnected.

The mode of operation will now be briefly described. If it is desired tothrow out Fig. 1, the corres ondin push-button, such as for instance t epus -button a, which hadfso far-been interrupted at the point w,

"willbe supplied with current. The magnet units and adapted to move intoand and the gear 7 will be connected with the cylinder shaft i by meansof the clutch s. The controlling shaft e being rotated from the cylindershaft 2', the eccentric is will rotate through 180 about the shaft e,until the roller it will enter the respective depression of the cam-discu. The lever of the eccentric is will rotate the bearing, and the rubbercylinder I) will be rocked by reason of the-eccentric mounting of thecylinder shaft 2' about the central axis of said bearing and willthereby be disconnected from the plate cylinder (1. When the cylinder I)has reached its inoperative position, it will be locked in said positionby means of the roller t. ,At the same time. the, projection 11 willpress the puslnbutton w. The current for the magnets will thus beinterrupted and the coupling .9 be disengaged by means of the spring a:so that the eccentric is will remain in a position of rest. By a furtherpressing of the push-button, a rotation of 180 will again be imparted tothe eccentric 7c and the rubber cylinder Z) will again be moved tooperative position, while the circuit for the magnets during theposition of rest of shaft 6, as shown in Figs. 1 and 3,

will remain. interrupted, the cam 41 having raised the contact cli Ifthe three switc lies 3 g and 3 are opened, the printing machines I, IIand III ,may be rendered inoperative individually, according as towhether the push-button W, n or n is depressed. If all the switches areclosed, a pressing of one of said three pushbuttons will cause all themagnets to respond, and consequently all the printing machines will bethrown out of 'operation. If only two of the switches are closed, onlythe corresponding printing machines will be rendered inoperative. Theclosing of the switches 3 and g for instance, will cause only theprinting machines I and II to be rendered inoperative. .In thearrangement as described, the, printing machines may, therefore, berendered inoperative e ther individually, in groups, or as a whole.

1. A device -for rendering operative and inoperative the cylinders andinking rollers .of rotary off-set printing machines having a pluralityof printing units," COIIIPIlSlIlg an actuator associatedwith each ofsaid printing units and adapted to move into and out of operativeposition the cylinder and inking rollers of said unit, an electriccircuit including the various actuators, and means enabling saidactuators to be operated either p simultaneously, individually or ingroups. ofv operation the printing machine shown in of rotary offsetprinting machines having a plurality of printing units, comprising anactuator provided for each of said rinting out of mums rollers of saidunit, an electric circuit including the actuators of saidunits, andmanually operated means enabling said actuators to be operated eithersimultaneously,

individually or in grou 3. A device as spe'c' ed in claim 2, comprisingan electrically. operated coupling connected in said electric circuit,and means associated with said actuator for automatically causing saidcoupling to be disconnected. 1

4. A device for rendering operative and inoperative the cylinders andinking rollers of rotary offset printing machines having a plurality ofprinting units comprising a rotatable shaft, an eccentric mountedthereonfor each of said ,printing units, operative connections between saideccentric and the cylinder and inking rollers of each unit, means forrotating .said shaft, an electric circuit including said means, a switchfor connecting and isconnectmg said means at will, and a means forautomatically disconnecting said means at predetermined intervals.

5. A device as specified in claim 4, comprising a notched discassociated with said eccentric, and a spring controlled roller adaptedto enter the notches in said disc for temporarily securing the variousparts in their positions.

6. A device for ofrotary ofiset printing machines having a plurality ofprinting units, comprising a rerendering operative and inoperative thecylinders and inking rollers tatable shaft, means associated with eachof I said printing units controlled by said shaft for moving into andout of operative position the cylinder and inking rollers of each ofsaid units,-means for rotating said shaft, a coupling between said shaftand said rotatingmeans, an electric circuit, electro magnets in saidcircuit for operating said coupling, and manuallyoperated means foropening andclosing said circuit. 7. A device as specified in claim 6,comprising means controlled by said rotatable shaft for automaticallyconnecting and disconnecting the means for moving said cylinders andinking rollers into and out of operative position.

In testimony whereof I have afiixed my signature.

LEONriARD HORN.

